Use binary expression as parent for better spacing (KT-27717)

When BINARY_EXPRESSION is used as parent, spacing rules for it are applied.
There're no rules for OPERATION_REFERENCE on the other side.

 #KT-27717 Fixed

idea/testData/formatter/SpacesAroundOperations.kt

@@ -27,6 +27,11 @@ class Some {
         12%3*12/3
 
         1..2
+
+        null ?: 3 + 1
+
+        val a = 1
+        null ?: a + a
     }
 }